I just had a person on a different website write to me about getting rid of trumpet vine they are located in Canada trying to get rid of an invasive TV. I was very suprised because we were on the same subject here. Deb if you want to keep yours plant it where you can use a lawn mower to keep any sprouts down the old barn sounds like a good location, just remember it will need a very sturdy trellis as it grows. Not sure if you have an old windmill or a not in use tall telephone pole at your place but I have seen them planted to grow up on them just to give you an idea as to how large they can get. Personally I would not put it near your compost pile as I am sure it would love to take over all the compost.
To be fair to to the TV mine was here for years before it decided to go on a rampage before that it was not to bad, it seems the more age they get they never get to a supposed mature point they just decide they would like to expand all over the place. When I got the start of mine I was still a inexperienced gardener as far as vines were concerened if only I had known I wouldn't have every planted the TV.
